“Caffeine is like any other diuretic; it can make you excrete fluid, and deplete your body of moisture,” says Dr. Hirsch. It can also dehydrate your skin. “Anything dehydrating can dehydrate your skin, making it look dull and aged.”
It’s simple to combat the consequences of one too many cups of coffee. “Moisturizer, hands down, is the easiest way to look younger instantly,” says Dr. Hirsch. Try one that has hyaluronic acid, a super-moisturizing ingredient that holds 1,000 times its weight in water.